I'll be the first to admit I don't understand about 75% of what you folks are saying :) BUT what I can say is that I tried the above linked kext (AppleIntelCPUPowerManagement.kext-PATCHED.zip) and my Mt. Lion 10.8 system booted without the need for the NullCPU kext.
Upon booting into the OS I loaded MSRDumper and opened up the console and let the system run for about 15 minuets. Saddly, all I got was one state and it was 16. I would asume my cpu was running at the bare minimum. Still, this is very promising. Thanks for the patched kext!
Use ICPUM .kext from 10.7.3 first... try it